Bridge multi-point deflection measurement and image acquisition device

Abstract

The utility model provides a bridge multi-point deflection measurement and image acquisition device, which comprises a shell and a handle, and the handle is arranged above the shell. The shell comprises a camera, a camera base, a battery and a switch button, and the camera comprises a camera body and a lens. On the other hand, the utility model provides a bridge multi-point deflection measuring device which comprises the image acquisition device, an adjusting base and a tripod, the adjusting base is fixedly connected with the tripod, and the image acquisition device is arranged on the adjusting base. The image acquisition device can be installed on one side of a starting point or a terminal point of a bridge and perform image acquisition and laser distance measurement, so that image data and distance data are obtained, operation is simple, data acquisition is quite efficient, and the image acquisition efficiency is high. Deflection data of multiple bearing positions such as a bridge axis can be obtained at one mounting point.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge image acquisition technical field, concretely is a bridge multi -point deflection measurement and image acquisition device. BACKGROUND

[0002] Bridge as the key component of traffic infrastructure, its structural stability and safety are very important. Deflection is one of the important parameters to evaluate the bridge structure health condition, which can reflect the deformation of the bridge under the action of load. The early bridge deflection data acquisition method includes the level data acquisition, the dial gauge data acquisition and the like, these methods often have the limitations such as few data acquisition points, low efficiency, difficult to realize real-time monitoring and remote data acquisition. With the development of bridge construction technology, the span of the bridge is larger and larger, the structure form is more and more complex, and the requirements for the accuracy of deflection data acquisition, multi-point synchronous data acquisition capability and data processing are also higher and higher. In order to guarantee the long-term safe operation of the bridge, it is necessary to carry out real-time and continuous structure health detection on the bridge, and timely find potential problems and damage, however, the staff needs to collect data at multiple positions on the bridge, which needs to spend a lot of manpower and time. SUMMARY

[0003] Therefore, the utility model aims at providing a bridge multi -point deflection measurement and image acquisition device, the image acquisition device can be installed at the starting point or the terminal point of the bridge and carry out image acquisition, and carry out laser ranging at the same time, so as to obtain the image data and distance data, simple operation and very efficient data acquisition can obtain the deflection data of the load bearing position such as bridge axis at one installation point.

[0004] To achieve the above object, the utility model provides an image acquisition device in one aspect, including casing and handle, the handle is arranged at the top of casing;

[0005] The casing includes camera, camera base, battery and switch button, the camera includes body and lens, the lens is connected with the body, and the lens is detachable, and the lens protrudes from the casing;

[0006] The camera base is arranged on one side of the casing, and the body is arranged on the camera base;

[0007] The battery is arranged in the casing and is electrically connected with the body;

[0008] The switch is arranged in the casing and is electrically connected with the body.

[0009] Preferably, it further includes a data transmission interface, the data transmission interface is arranged on the surface of the casing, and the data transmission interface is electrically connected with the body.

[0010] Preferably, a laser ranging device is further included, the laser ranging device is arranged in the shell and arranged on the same side as the camera, and a direction in which the laser ranging device emits laser is consistent with a direction of the lens.

[0011] The utility model discloses a bridge multi-point deflection measuring device on the other side provides a bridge multi-point deflection measuring device, including:

[0012] The utility model discloses an image acquisition device, adjustment base and tripod as above, adjustment base with tripod fixed connection, image acquisition device sets up on adjustment base.

[0013] The image acquisition device can be installed on one side of the starting point or the terminal point of the bridge and perform image acquisition and laser ranging simultaneously, so as to obtain the image data and the distance data, which is simple in operation and efficient in data acquisition. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0015] Figure 1 It is a side view of the image acquisition device disclosed by the utility model;

[0016] Figure 2 It is a schematic view of the bridge multi-point deflection measuring device disclosed by the utility model;

[0017] Figure 3 It is a schematic view of the utility model in working;

[0018] Figure 4 It is a schematic view of the reference image and the acquisition image of the utility model. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0020] As Figure 1 shown, the embodiment discloses an image acquisition device 8, comprising a shell and a handle 1, the handle 1 is arranged above the shell;

[0021] The shell comprises a camera, a camera base 3, a battery 6 and a switch 5, the camera comprises a body 2 and a lens 4, the lens 4 is connected with the body 2, and the lens 4 is detachable, and the lens 4 protrudes from the shell;

[0022] The camera base 3 is arranged on one side of the shell, and the body is arranged on the camera base 3;

[0023] The battery 6 is arranged in the shell and is electrically connected with the body 2;

[0024] The switch 5 is arranged in the shell and is electrically connected with the body 2.

[0025] In the embodiment, the handle 1 is arranged above the shell, which facilitates the installation of the image acquisition device 8 below a tripod or other mounting position; the camera base 3 is used for fixing the position of the body 2 in the shell, so as to ensure the stability of the body 2; because the imaging distance is different due to different mounting points or different bridge lengths, the detachable lens 4 enables the person skilled in the art to replace the lens 4 according to the actual situation, so that a clear image can be obtained.

[0026] In a preferred embodiment, the image acquisition device 8 further comprises a data transmission interface 7, the data transmission interface 7 is arranged on the surface of the shell, and the data transmission interface 7 is electrically connected with the body 2; the data transmission interface 7 is used for transmitting the image data collected by the camera to a computer.

[0027] In a preferred embodiment, the image acquisition device 8 further comprises a laser ranging device (not shown in the figure), the laser ranging device is arranged in the shell and is arranged on the same side as the camera, the direction of laser emission of the laser ranging device is consistent with the direction of the lens, and the laser ranging device is electrically connected with the switch 5; the laser ranging device is used for obtaining the distance between the image acquisition device 8 and the image at the same time of collecting the image.

[0028] As Figure 2 shown, the utility model discloses a bridge multi-point deflection measuring device 11, comprising:

[0029] The above-mentioned image acquisition device 8, adjusting base 9 and tripod 10, adjusting base 9 and tripod 10 fixed connection, image acquisition device 8 sets up on adjusting base 9.

[0030] The adjustment base 9 is fixedly connected with the tripod 10 in this embodiment, so that the image acquisition device 8 can be detachably arranged on the adjustment base 8 by means of buckles, buttons, screw holes, limiting grooves or the like, so that the tripod 10 can be replaced in some scenes in which the tripod 10 is not applicable, or the image acquisition device 8 can be replaced for use when the image acquisition device 8 is faulty.

[0031] The following is the measurement principle of this embodiment (all data below are for illustration only and do not limit specific parameters) :

[0032] First, the embodiment is installed at the starting point or the end point of the bridge, and then the image acquisition device 8 collects the image in the field of view and transmits the image to the computer through the data line, and then the user selects the deflection measurement marker point in the image in the image window, measures the actual distance from the marker point to the image acquisition device 8 (obtained by the laser ranging device), and annotates the distance of the marker point. According to the formula and the lens formula, the linear relationship between the camera focal length and the imaging distance is obtained, and the following formula is obtained: 1 / f = 1 / s + 1 / i. Wherein, f represents the focal length, s represents the object distance, and i represents the imaging distance. As can be seen from the above formula, when the object distance s is infinite (i.e. the light is approximately parallel light), the imaging distance i is equal to the focal length f. In this case, the imaging surface is usually called an infinite plane or a back focal plane. For general cases, the imaging distance i will change with the change of the object distance s.

[0033] The selection of the marker point is generally the center point of the area with light and dark differences, and a single gray value point cannot be selected as the marker point. The related algorithm selects a 49*49 pixel matrix block centered on the marker point, and the size of the matrix block can be set according to the parameters, but the horizontal and vertical directions should be an odd number of pixels (generally 49*49). The average gray gradient in the matrix block reflects the judgment standard of the actual movement trend of the object. The average gray gradient is defined as follows: Wherein, w and h are the width and height of the pixel matrix block in the image; is the square root of the gray gradient of the pixel point in the horizontal direction and the vertical direction.

[0034] However, in actual situations, as shown in Figure 3 , the image collected by the image acquisition device 8 will be deformed due to the angle; the image before deformation is called “reference image”, and the deformed image is called “deformed image”. The displacement information of the measurement points is directly obtained by analyzing and processing the digital images of the measured object surface before and after deformation. As shown in Figure 4As shown, in the reference image, a 49*49 pixel size reference pixel rectangular block centered on the marker point (x, y), in the deformed image, by searching for the pixel rectangular block centered on (x', y') with the global extreme value of the correlation coefficient of the reference pixel rectangular block, to determine the displacement u, v of the reference pixel rectangular block. This embodiment can track the sub-pixel accuracy of the image plane displacement of the pixel points in the "deformed matrix block" in the "reference matrix block", and the obtained image plane displacement can be further converted into the real object plane displacement. In a two-dimensional digital image correlation measurement system, the digital camera pixel size p, the sensor size s, and the lens focal length f are fixed parameters. According to the vertical elevation angle α, the horizontal angle β, the imaging position (x, y) of the measured point in the image, and the actual distance d of the measured point from the measurement system, the scale factor of the marker point on the image plane and the object plane can be calculated:

[0035] K(X,Y)=k(p,s,f,α,β,(x,y),d)Under this condition, the image plane displacement [u(x,y), v(x,y)] obtained by the digital image correlation method is obviously linearly proportional to the displacement [U(X,Y), V(X,Y)] of the object surface:

[0036] u(x,y)=KU(X,Y),v(x,y)=KV(X,Y)In the deformed image, by searching and calculating according to the correlation function, the displacement of the marker point is calculated by searching for the rectangular region centered on (x', y') with the maximum correlation coefficient C of the template. Finally, the deflection data of the bridge is calculated by the above formula.

[0037] The bridge multi-point deflection measurement device 11 disclosed in this embodiment has the following beneficial effects:

[0038] 1. Improve the measurement accuracy and reliability, can accurately measure the dynamic deflection of multiple points of the bridge at the same time, reduce the error and uncertainty caused by single point measurement, and provide more comprehensive and accurate bridge deformation information.

[0039] 2. Reduce maintenance cost, early detection of bridge diseases and damage, targeted maintenance and repair, avoid high cost caused by large-scale repair or reconstruction.

[0040] 3. Ensure smooth traffic, by timely understanding the safety condition of the bridge, reasonable arrangement of traffic control and maintenance time can reduce the interference and congestion caused by bridge maintenance to traffic.

[0041] 4. Promote the development of bridge engineering technology and the progress of bridge monitoring technology, and provide important technical means and data support for the research and innovation in the field of bridge engineering.

[0042] The various embodiments described in this specification are presented for the purpose of illustration and description. Each of the embodiments highlights a different aspect of the disclosure, and the embodiments are presented separately for ease of understanding. The same or similar elements are common throughout the embodiments and are not repeated in the description.

[0043] The above description of disclosed embodiments enables one of ordinary skill in the art to make and use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An image capturing device, characterized by, The image acquisition device comprises a shell and a handle, the handle is arranged above the shell; The shell comprises a camera, a camera base, a battery and a switch button, the camera comprises a body and a lens, the lens is connected with the body, and the lens is detachable, and the lens protrudes from the shell; The camera base is arranged on one side of the shell, and the body is arranged on the camera base; The battery is arranged in the shell and is electrically connected with the body; The switch is arranged in the shell and is electrically connected with the body.

2. The image acquisition device of claim 1, wherein, Further comprising a data transmission interface, the data transmission interface is arranged on the surface of the shell, and the data transmission interface is electrically connected with the body.

3. The image acquisition device of claim 1, wherein, Further comprising a laser ranging device, the laser ranging device is arranged in the shell and is arranged on the same side as the camera, the direction of laser emitted by the laser ranging device is consistent with the direction of the lens, and the laser ranging device is electrically connected with the switch.

4. A bridge multi-point deflection measuring device, characterized by, Comprise: The image acquisition device, the adjusting base and the tripod of any one of claims 1 to 3, the adjusting base is fixedly connected with the tripod, and the image acquisition device is arranged on the adjusting base.

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